Mathematical kangaroo was initiated by PeterO'Halloran, a famous Australian mathematician, in 1980, and has a history of more than 40 years. 199 1 year, two famous French mathematicians formally established the competition organizing Committee and popularized it in Europe. In honor of PeterO'Halloran, the competition was officially named "Kangaroo Mathematics Competition". In the United States, the kangaroo math competition has been held for more than 20 years, and the number of participants is increasing rapidly every year. Especially in California, which has a large Asian population, it is difficult to find a kangaroo math test every year. In Britain, kangaroo math competition is used to select the national team for the Olympic math competition.